Remove unused exec resource to refresh network interfaces

This resource was used to set up nova-network, which was already
removed.

Change-Id: Ia2adbe27d7a586176a3bcc8adadc2d952e541d03
(cherry picked from commit 16aa7716ac)

manifests/compute.pp

@@ -440,7 +440,6 @@ class nova::compute (
     package_name   => $::nova::params::compute_package_name,
     service_name   => $::nova::params::compute_service_name,
     ensure_package => $ensure_package,
-    before         => Exec['networking-refresh']
   }
 
   if $force_config_drive {

manifests/init.pp

@@ -568,13 +568,6 @@ but should be one of: ssh-rsa, ssh-dsa, ssh-ecdsa.")
     tag     => ['openstack', 'nova-package'],
   }
 
-  # used by debian/ubuntu in nova::network_bridge to refresh
-  # interfaces based on /etc/network/interfaces
-  exec { 'networking-refresh':
-    command     => '/sbin/ifdown -a ; /sbin/ifup -a',
-    refreshonly => true,
-  }
-
   resources { 'nova_config':
     purge => $purge_config,
   }

spec/classes/nova_init_spec.rb

@@ -25,11 +25,6 @@ describe 'nova' do
         is_expected.to contain_nova_config('DEFAULT/rootwrap_config').with_value('/etc/nova/rootwrap.conf')
       end
 
-      it { is_expected.to contain_exec('networking-refresh').with(
-        :command     => '/sbin/ifdown -a ; /sbin/ifup -a',
-        :refreshonly => true
-      )}
-
       it 'does not configure auth_strategy' do
         is_expected.not_to contain_nova_config('api/auth_strategy')
       end